Evaporator protector



March 27, 1928. 1,664,133

c. w. SCHEDLER EVAPORATOR PROTECTOR Filed Nov. 11, 1925 2 Sheets-Sheet 1INVENTOR.

March 27, 1928.

C. W. SCHEDLER EVAPOEATOR PROTECTOR Filed Nov. 11, 1925 2 Sheets-Sheet 23; 5 P--) 4 g 3} 40 I 7' 35 INVENTOR.

arzMizrdadzzedzen Patented Mar. 27, 1928e UNITED sTAT s CARL WILLIAMSGHEDLER, or BERKELEY, onnlronnra.

EVAPORAT OR PROTECTOR.

Application filed November This invention relates. to a protector foreva-porators and itsobject is to. prevent the wear of the steam drum oftheievaporator which makes its renewal at great expense afrequentoccurrence. Itwill be understood by those skilled in the art that steam.evaporators make use of a large drum'which is provided with severalhundred small tubes, which drum. costs from $2500.00 to $3000.00 new andwhich requires the dis.- mantling of the evaporator to replace the drum,and this not only ties up the plant for a day or two, but is veryexpensive in addition. I

In such evaporators as are herein disclosed, the liquid to be evaporatedis run into a closed receptacle within which the steam drumis installedand the receptacle is maintained under a vacuum of from ten to twentyfive or more, inches of mercury. In order to operate the evaporator atthe highest efiiciency it is very necessary to have the fresh liquid fedinto the evaporator at a certain point, and for some reason, the steampipe leading to the drum erodes through in a very short time just at thejunction thereof with the steam drum, and the steam drum itself erodesthrough in an equally short time just opposite the end of the feed pipe30 for the fresh liquid, probably due to rapid evaporation andcrystallization of the solids. I have ascertained that by placing arenewable plate on the drum and a divided renewable sleeve on the steampipe, both of which can be dismounted and renewed or repaired. byoperating through the evaporator manholes, whatever wear there may be onthose plates will not affect the steam drum or the steam pipe, with theadded benefit of making the replacement a matter of only an hour or twoinstead of requiring a day or more. In this way the life of the steamdrum and the steam pipe leading thereto has been increased four or fivetimes over an ordinary steam drum not so equipped. The wear seems to bedue to the sudden expansion of the liquid when it strikes the region ofthe high vacuum, with the consequent sudden deposit of crystals of thematerial in solution.

An embodiment of the invention is shown in the accompanying drawings inwhich the same reference numeral is applied to the same portionthroughout the several figures 11, 1925. Serial No. 68,255; r

of thedrawings and. of which there may be: modifications.thereof. I

Fig. 1 is a vertical sectional .view ofthe:

The shell-of the evaporator is made'up of two lower conical sections-.1;and 2, two cylindrical. sections3 and 4, a'top section 5, andra specialpipemanifold 6 to which the" steampipe 7 is connected and to whichthe'pipes leading to the vacuum pump may be 7 connected. The top member 6has a flange .9, and all of the parts of the shell are suitably flangedto have the parts connected by bolts 10. The steam pipe 7 passes intothe evaporator through a suitable stuffing box 7f at the top of thesame.

The bottom 1 has two discharge pipes 12 and 13 connected thereto whichare controlled by suitable valves, and the shell has manholes 14 and 15through, which the workman can insert and place the new plate. and theparts for the steam pipe. The shell 3 has the fresh liquid supply pipeconnected thereto as shown at 16.

The steam drum has a slightly conical bottom 17 and correspondinglyconical top 18, both of which are flanged downwardly and connected tothe cylindrical shell 19, and a great number of small tubes 20 connectthe top and bottom to give the necessary area for the rapid transferenceof heat from the drum to the liquid in the evaporator.

The steam drum is ordinarily supported by the steam pipe and by threecentering brackets 22, 23 and 24, in turn resting on three lugs 25, 26and 27 formed on a memher 2, while a drill pipe 28 leads to a trap fordraining the water out of the steam drum as fast as condensation takesplace.

On account of the erosion and rapid destruction of the steam pipe.adjacent to drum, it hasbeen common to make use of a short length ofpipe as indicated at 29 to avoid the necessity of renewing-the entiresteam pipe when the drum has to be renewed, and with the presentinvention, the

same short section of pipe is used but it is covered with a sectionalsleeve consisting of four flanged parts 30, each secured to the adjacentpart by means of three bolts 31, and the lower end of which sleevecovers the drum connecting flange and the rivets by which it isconnected to the short steam pipe section 29.

For considerable area in front of the liquid inlet pipe 16 the steamdrum itself is protected with a detachable plate 33, which plate has anangle plate 34 secured thereto at its lower edge, and said angle platehas two holes therein to receive the lower ends of two rods 35 and 36which are passed through two of the tubes of the steam drum, and whichare connected by means of two eyebolts 37 and 38, and the two upwardlyprojecting ears 39 and 40 of the plate 33. The foregoing method ofattachment of the plate to the steamdrum is especially applicable tothose installations where the drum is already in place. v

The manner of ebullition of the liquid through and around the steam drumis indicated by the arrows in Figure 1 and it appears to be necessary tohave the fresh liquid inlet pipeat the place indicated to properlymaintain this condition, while if it is not maintained, the operation ofthe evaporator will be seriously interfered with, and its elliciencygreatly reduced.

Having thus described my invention, what I desire to secure by LettersPatent of the United States, is as follows, but modifications may bemadein carrying out the invention as shown in the drawings and in theabove particularly described form thereof, within the purview of theannexed claim.

In an evaporator having a shell and a steam drum disposed therein, saidsteam drum comprising. a steam chamber traversed by substantiallyvertical liquid tubes, and said shell having its liquid inlet disposedbetween the planes bounding the top and the bottom of said drum,adetachable plate between said drum and said liquid inlet of said platehaving. two upwardly extending ears, eyebolts in said ears,rods engagingsaid eyebolts and passing through tubes in said steam drum, anangleplate on the bottom of said detachable plate, and holes in saidangle plate receiving thelower end of said rods. I

In testimony whereof I have hereunto set my hand this 5th day ofNovember A. D, 1925.

CARL WILLIAM SCHEDLER.

